Textile fiber drafting roll



NOV. 9 E. J. COURTNEY TEXTILE FIBER DRAFTING ROLL Filed Oct. 2, 1946 FIGZ FIG. 3

FIG. 5

[NI 'ENTOR.

EgfWARD J. COURTNEY 4 m Patenterl Nov. 22, 1949 UNITED STATES PA NT OFFICE mfillfifiifif? 7 Application October 2, 1946, serum. 700,737

Claims. (Cl. 19-143) 1 This invention relates to textile fiber drafting rolls and is concernedparticularly with rolls for use in the so-called Bradford system employed in the drafting of worsteds, although the invention is not limited thereto.

The present invention is a modification and improvement of the roll disclosed and claimed in my copending' application, Serial No. 659,489, filed April 4, 1946, and entitled Spinning roll for spinning and drawing frames," now Patent 2,417,- 239, issued March 11, 1947. The present invention also relates to an improved roll covering for drafting rolls.

In my copending application above referred to, I have disclosed a novel roll structure which includes a pair of clamping disks which engage the roll cover and frictionally retain it in position. The rolls of my prior application have met with immediate public acceptance and are extensively used in the drafting of worsteds. Such rolls are now commonly referred to as Courtney-Jensen" rolls.

The present invention is particularly concerned with the problem of maintaining a true cylindrical surface on the cover at the fiber drafting surface and to a cover which will maintain its cylindrical drafting surface when positioned in the roll and clamped in place and also during normal service life. 7

It is an object of my invention to provide a roll structure of the Courtney-Jensen type, including 'a soft yielding drafting cover so constructed and arranged that a truly cylindrical surface will be presented for drafting purposes and will be permanently maintained throughout the service life of the cover.

A further object of my invention is to provide a drafting roll cover which may be readily fabricated and which may be supplied to the textile mills for installation on Courtney-Jensen type rolls with facility.

In order that my invention may be readily understood, I shall describe the same in conjunction with the attached drawing in which:

Figure 1 is a plan view of a Courtney-Jensen type roll embodying my invention;

Figure 2 is a plan view of the improved roll covering of my invention;

Figure 3 is a sectional view of the roll covering shown in Figure 2 and taken along the line III-III thereof;

Figure 4 is a detailed sectional view showing the clamping arrangement and the roll cover taken on the line IVIV of Figure 1 to an enlarged scale; and,

2 Figure 5 is a plan view of one of the clamping end disks shown in Figures 1 and 4.

Referring to Figure 1, there is shown a Courtnay-Jensen type roll including a spindle 2 upon which are mounted for rotation with respect thereto a pair of drafting rolls 3- and 4. The rolls 3 and I each include drafting covers 5 and I which are held in place by end disks 1 and 8 and 9 and I 0, respectively. The details of the construction of the mounting mechanism shown in Figure 1 are more fully disclosed in my aboveidentified patent which is incorporated herein by reference.

The roll covers 5 and 6 are shown in Figures 2 and 3 and consist of an inner layer II which is made in the form of a hollow cylindrical tube of a substantially incompressible material. I have found that a tube formed of fibers impregnated and bonded with a phenol-formaldehyde resin is admirably suited for this purpose. In a drafting cover having an internal diameter of about 4%" a tube having a wall thickness of 3/64" has been found acceptable. Such a tube is incompressible along its axis and is substantially free from any ghange due to climatic or mill operating condiions.

There is bonded to the'inner reinforcing layer II a facing layer I! having a fiber drafting surface It. According to my preferred practice, the

facing layer I2 is integrally united with the reinforcing layer H by bonding the same directly thereto. Where the fiber drafting facing layer is formed with a binder of synthetic rubber, this 'may be conveniently accomplished by applying the facing stock over the reinforcing layer I I with an interposed bonding cement and vulcanizlng the facing layer directly to the inner reinforcing layer.

I have found that excellent drafting results are obtained with a facing layer formed of the following composition in which all parts are given Perbunan is a commercially available synthetic rubber formed of butadiene and acrylonitrile and constitutes the binder for the facing layer. The softener may be any one of the well known types or mixtures thereof, such as hydrocarbon oils, 'Iriacetin," or the like. Sulphur in the above formulation is, of course, a vulcanizin agent, and zinc oxideis an activator. The benzothiazyl disulfide is an accelerator available on the market under the trade name Altax. While I prefer to incorporate cork in the composition, it may be eliminated, but I have found that particularly good results are achieved when cork isincorporated. Other organic fillers may be incorporated in place of cork, if desired, or may be used in substitution for a part of it. In place of Perbunan," other synthetic rubbers possessing the requisite physical characteristics for textile fiber drafting may be used. These characteristics are well known to those engaged in this industry, and since the present invention is not concerned with any specific composition for the facing layer, a further description is not believed to be necessary. Binders other than synthetic rubber may also be used.

In fabricating the roll, I prefer to take a hollow cylindrical tube of the reinforcing material, coat the same with a bonding material, such as a reactive phenol-aldehyde resin, a rubber hydrochloride cement, or the like, and directly wrap therearound a thin sheet of the facing material,

continuing the wrapping of convolutions of this I material until the r quisite t ickness has been obtained. Sheets .020" to .030" in thickness and of a width equivalent to the len th of the tube may be employed, and the facing layer built up to about /2 inch thickness. I thereafter wrap the assem ly with wet fabric tape and cure in open steam for about 55 minutes at 300 F. The fabric tape is then removed and the surface ground to a true cylindrical shape. The material is then severed into sections of the desired width for use and are ready for assembly.

The assembly of the cover with a Courtney- Jensen type ro l is shownin Figure 4. There are a pair of end disks 9 and ill. the end disk 9 being shown in plan in Figure 5. Each of the end disks 9 and l 0 includes a substantially cylindrical flange having a substantially cylindrical cover engaging portion H which extends axially outwardly from a enerally circular base l5 of the end disk. The cylindrical cover engaging portion l4 terminates in a hollow bead l6 which extends outwardly, upwardly. and inwardly as shown in Figure 4, and terminates in a cut surface I! which lies at an angle to a downwardly and outwardly inclined inner circumferential clamping surface I! of the bead. The portion of the bead l6 adiacent the terminal ed e I! constitutes a generally radially directed inclined projection of which'the inclined circumferential clamping surface I 8 is a part. The cut edge ll of this projection constitutes a downwardly and inwardly directed surface which is disposed at an angle to the general plane of the faces of the circular base l5. It will be observed from an examination of Figure 4 that a wedgeshaped annulus I9 is thus formed which constitutes the innermost edge of the bead. As shown in Figure 5,'this wedge I! may be serrated or knurled as indicated at 20. In the embodiment chosen for illustration, there are four knurled areas, although the entire wedge-shaped portion l9 may be knurled if desired. The knurling may be provided on one or both of the end disks 9 and I0, but for best results, I prefer t provide the knurling on both of the disks.

In assembly, the cover 6 is slipped over the end disk Hi. It will be noted that the inner diameter of the reinforcing layer ll corresponds with the of each of the disks 9 and it. The end disk 9 is then slipped into position within the opening in the cover 6, and screws 2| are positioned through openings 22 in the end disk 9 and are received within screw threaded bosses 23 in the end disk I0. Figure 4 shows the assembled parts prior to final clamping and with the edges [9 engaging the facing layer II.

It will be observed that the inner reinforcing layer II is of a thickness which permits it, when assembled, to lie below the cut edge I! of the bead l6 so that upon clamping, the cut edge I1, and particularly the wedge-shaped annulus l9, may be imbedded in the facing layer l2. Since the facing layer I2 is soft and compressible, excellent frictional engagement may be secured between the clamping end disks and the roll cover. It is important that the beads formed on the end disks be so shaped that the cut surfaces ll engage the facing layer II in the vicinity of the joint between the facing layer l2 and the reinforcing layer li. Substantial axial pressure is applied to the facing layer in this clamping operation, but the reinforcing layer ll being incompressible prevents deformation of the facing layer. Without the reinforcing layer ll, clamp ing of the cover by the end disks would result in radial expansion of the facing layer 12 in an outwardly direction which would destroy the true flat cylindrical surface I! which is essential to proper fiber drafting.

The reinforcing layer II also serves to prevent the cover upon axial compression from being distorted into the area 24 between the end disks. Any such expansion of the facing layer into that area would result in deformation of the drafting surface I: and, consequently, proper drafting of fibers would not be obtained.

With the roll of my invention, the clamping screws 2| may be drawn up sufliciently to secure a very firm connection between the roll proper and the covering without any danger of deformation of the fiber drafting surface either at the time of assembly or subsequently in service, whether such deformation results from radial expansion outwardly due to the penetration of the beads on the end disks into the facing material or inwardly due to expansion of the roll covering material into the area between the end disks.

While I have described my roll and cover as particularly suited for textile fiber drafting in the Bradford system which is used extensively in the drawing and spinning of wool flbers, my invention is not limited thereto since it will be useful in the drafting of cotton, rayon, and other fibers as well.

While I have illustrated and described a preferred embodiment of my invention, it will be understood that the same is not limited thereto but may be otherwise embodied and practiced within the scope of the following claims.

I claim:

1. In a textile fiber drafting roll, a pair of clamping end disks each comprising a generally circular base, a substantially cylindrical flange extending axially outwardly from the base, a substantially cylindrical cover-engaging surface on said flange, a hollow head on the terminal end of said flange and extending outwardly, upwardly, and inwardly and terminating in a cut surface, and a downwardly and outwardly inclined circumferential clamping surface on said bead; means for clamping said end disks in assembled position with their axial flanges extending in op- OlltBl diameter Of the cover engaging P0111011 7 girections and forming an annular coverreceiving recess defined by said cover-engaging surfaces of said flanges and the oppositely disposed downwardly and outwardly inclined circumferential clamping surfaces of said beads; and a hollow cylindrical roll cover disposed within said annular cover-receiving recess, said roll 'cover comprising an outer compressible fiber working facing layer and an inner substantially incompressible reinforcing layer substantially coextensive axially with said outer facing layer, the inside diameter of said inner reinforcing layer substantially coinciding with the diameter of said cylindrical cover-engaging surfaces of said flanges, the axial length of said inner reinforcing layer being greater than the distance between said out surfaces of said heads when said circular bases are in juxtaposed clamped position, and the thickness of said inner reinforcing layer being less than the height of said beads measured as the distance from said cylindrical cover-engaging surfaces of said flanges to said out surfaces of said beads, said cut surfaces of said beads engaging said outer facing layer in the vicinity of the joint between said outer facing layer and said inner reinforcing layer and said inclined circumferential clamping surfaces of said beads engaging said outer facing layer and said inner reinforcing,

layer and urging the inner cylindrical surface of said inner reinforcing layer into engagement with said cover-engaging surfaces of said flanges, said outer facing layer being free of radial expansion which would distort the fiber work n surface thereof.

2. In a textile fiber drafting roll comprising a pair of clamping end disks each formed of a generally circular base, a substantially cylindrical flange extending axially outwardly from the base,

a substantially cylindrical cover-engaging surface on said flange, a hollow bead. on the terminal end of said flange and extending outwardly, upwardly, and inwardly and terminating in a inclined circumferential clamping surface on said bead, means for clamping saidenddisks in assembled position with their axial'flanges extending in opposite directions and forming an annular cover -receiving recess defined by said cover-engaging surfaces of said flanges and the oppositely disposed downwardly and outwardly inclined circumferential clamping surfaces of said inner reinforcing layer and said inclined circumferential clamping surface of said beads engaging said outer facing layer and said inner reinforcing layer and urging the inner cylindrical surface of said inner reinforcing layer into engagement with said cover-engagin surfaces of said flanges whereby the outer facing layer will be free of radial expansion which would distort the fiber working surface thereof.

3. In a textile fiber drafting roll, a pair of clamping end disks each of which comprises a generally circular base, a substantially cylindrical flange extending axially outwardly from the base, a substantially cylindrical cover-engaging surface on said flange, a radially directed inclined projection on the terminal end of said flange terminating in a cut surface and a downwardly and outwardly inclined circumferential clamping surface on said projection; means for clamping said end disks in assembled position with their axial flanges extending in opposite directions and forming an annular cover-receiving recess defined by said cover-engaging surfaces of said flanges and said oppositely disposed downwardly and outwardly inclined circumferential clamping surfaces of said,

projections; and a hollow cylindrical roll cover disposed within said annular cover-receiving recess, said roll cover comprising an outer compressible fiber working facing layer and an inner substantially incompressible reinforcing layer substantially coextensive axially with said outer facing layer, the inside diameter of said inner reinforcing layer substantially coinciding with the diameter of said cylindrical cover-engaging surfaces of said flanges, the axial length of said inner reinforcing layer being greater than the distance between said out surfaces of said projections when said circular bases are a projections engaging said outer facing layer in thevicinity of the joint between said outer facing 'layer and said inner reinforcing layer and said inclined circumferential clamping surfaces cut. surface, and a downwardly and outwardly in juxtaposed clamped position, and the thickness of said inner reinforcing layer being less than the height of saidprojections measured as the distance from said cylindrical cover-engaging surfaces of said. flanges to said'cut surfaces of said projections, said out surfaces of said of said projections engaging said outer facing layer and said inner reinforcing layer and u g v in the inner cylindrical surface of said inner reinforcing layer into engagement with said face thereof. I I

4. In a textile fiber drafting roll comprising a pair of clamping end disks each formed of a generally circular base, a substantially cylindrical flange extending axially outwardly from the base, a substantally cylindrical cover-engaging surface. on said flange, a hollow bead on theterminal end of said flange and extending outwardly, upwardly, and inwardiy and terminating in a cut surface, and a downwardly and outwardly inclined circumferential clamping surface on said bead, means for clamping said end disks in assembled position with their axial flanges extending in opposite directions and forming an annular cover-receiving recess defined by said cover-engaging surfaces of said flanges and the oppositely disposed downwardly and outwardly inclined circumferential clamping surfaces of said beads; a hollow cylindrical cover comprising a hollow cylindrical substantially incompressible inner reinforcing layer formed of fibers impregnated with a stiffening agent, said inner reinforcing layer resisting deformation from axial pressure, and a yielding and compressible fiber drafting facing layer formed of a composition including butadiene-acrylonitrile synthetic rubber bonded to the innner reinforcing layer, said inner reinforcing layer being substantially coextensive axially with said outer facing layer, the cover being constructed and arranged to be received within said annular cover-receiving recess in the drafting roll with the inside diameter of said inner reinforcing layer substantially coinciding with the diameter of said cylindrical cover-engaging surfaces of said flange with the cut surfaces of said beads engaging said outer facing layer in the vicinity of the joint between said outer facing layer and said inner reinforcing layer and said inclined circumferential clamping surfaces of said beads engaging said outer facin layer and said inner reinforcing layer and urging the inner cylindrical surface of said inner reinforcing layer into engagement with said cover-engaging surfaces of said flanges whereby the outer facing layer will be free of radial expansion which would distort the fiber working surface thereof.

5. In a. textile fiber drafting roll, a pair of clamping end disks each comprising a generally circular base, a substantially cylindrical flange extending axially outwardly from the base, a substantially cylindrical cover-engaging surface on said flange, a radially directed inclined projection on the terminal end of said flange terminating in a cut edge, spaced serrations formed in said out edge, and a downwardly and outwardly inclined circumferential clamp a hollow cylindrical roll cover disposed within said annular cover-receiving recess, said roll cover comprising an outer compressible fiber working facing layer and an inner substantially incompressible reinforcing layer substantially coextensive axially with said outer facing layer, the inside diameter of said inner reinforcing layer substantially coinciding with the diameter of said cylindrical cover-engaging surfaces of said flanges, the axial length of said inner reinforcing layer being greater than the distance between said out edges of said projections when said circular bases are in juxtaposed clamped position, and the thickness of said inner reinforcing layer being less than the height of said projections measured as the distance from said cylindrical cover-engaging surfaces of said flangesto said out edges of said projections, said out edges of said projections engaging said outer facing layer in the vicinity of the joint between said outer facing layer and said inner reinforcing layer and said inclined circumferential clamping surfaces of said projections engaging said outer facing layer and said inner reinforcing layer and urging the inner cylindrical surface of said inner reinforcing layer into engagement with said cover-engaging surfaces of said flanges, said outer facing layer being free of radial expansion which would distort the fiber working surface thereof.

6. In a textile fiber drafting roll, a pair of clamping end disks each comprising a generally circular base, a substantially cylindrical flange extending axially outwardly from the base, a substantially cylindrical cover-engaging surface on said flange, a radially directed inclined projection on the terminal end of said flange terminating in an inwardly and downwardly directed surface disposed at an angle to the general plane of the faces of said circular base, a plurality of serrations provided in said inwardly and downwardly directed surface in the line where said surface joins the inner surface of said projection, and a downwardly and outwardly inclined circumferential clamping surface on said projection extending from said inwardly and downwardly directed surface to said substantially cylindrical coverengagiiig surface on said flange; means for clamping said end disks in assembled position with their axial flanges extending in opp site direc: A

tions and forming an annular cover-receiving recess defined by said cover-enga ing surfaces of said flanges and said oppositely disposed downwardly and outwardly inclined circumferential clamping surfaces of said projections; and a hollow cylindrical roll cover disposed within said annular cover-receiving recess, said roll cover comprising an outer compressible fiber working facing layer and an inner substantially incompressible reinforcing layer substantially coextensive axially with said outer facing layer, the inside diameter of said inner reinforcing layer substantially coinciding with the diameter of said cylindrical cover-engaging surfaces of said flanges, the axial length of said inner reinforcing layer being greater than the distance between said inwardly and downwardly directed surfaces of said projections when said circular bases are in juxtaposed clamped position, and the thickness of said inner reinforcing layer being less thanthe height of said projections measured as thedistance from said cylindrical cover-engaging surfaces of said flanges to said inwardly and downwardly directed surfaces of said projections, said inwardly and downwardly directed surfaces of said projections eng in said outer facing layer in the vicinity of the joint between said outer facing layer and said inner reinforcing layer and said inclined circumferential clamping surfaces of said projections engaging said outer facing layer and said inner reinforcing layer and urging the inner cylindrical surface of said inner reinforcing layer into engagement with said cover-engaging surfaces of said flanges, said outer facing layer being free of radial expansion which would distort the fiber working surface thereof.

7. In a textile fiber drafting roll comprising a pair of clamping end disks each formed of a generally circular base, a substantially cylindrical flange extending axially outwardly from the base, a substantially cylindrical cover-engaging surface on'said flange, a hollow bead on the terminal end of said flange and extending outwardly, upwardly, and inwardly and terminating in a cut surface, and a downwardly and outwardly inclined circumferential clamping surface on said bead, means for clamping said end disks in assembled position with their axial flanges extending in opposite directions and forming an annular cover-receiving recess defined by said coverengaging surfaces of said flanges and the oppositely disposed downwardly and outwardly inclined circumferential clamping surfaces of said beads; a hollow cylindrical cover comprising a hollow cylindrical substantially incompressible inner reinforcing layer formed of fibers impregnated with a stifiening agent, said inner reinforcing layer resisting deformation from axial pressure, and an outer yielding and compressible fiber drafting facing layer formed of a mixture of butadiene-acrylonitrile synthetic rubber binder and cork particles bonded to said inner reinforcing layer, said inner reinforcing layer holding said outer facing layer against deformation of the working surface thereof upon the application of axial pressure to said outer facing layer in the vicinity of the joint between the inner reinforcing and said outer facing layers, said inner reinforcing layer being substantially coextensive axially with said outer facing layer, the cover being constructed and arranged to be received within said annular cover-receiving recess in the drafting roll with the inside diameter of said inner reinforcing layer substantially coinciding with the diameter of said cylindrical cover-engaging surfaces of said flange with the cut surfaces of said beads engaging said outer facing layer in the vicinity of the joint between said outer facing layer and said inner reinforcing layer and said inclined circumferential clamping surfaces of said beads engaging said outer facing layer and said inner reinforcing layer and urging the inner cylindrical surface of said inner reinforcing layer into engagement with said cover-engaging surfaces of said flanges whereby the outer facing layer will be free of radial expansion which would distort the fiber working surface thereof.

8. In a textile fiber drafting roll, a pair of clamping end disks each comprising a generally circular base, a substantially cylindrical flange extending axially outwardly from the base, a substantially cylindrical cover-engaging surface on said flange, a radially directed inclined projection on the terminal end of said flange terminating in an inwardly and downwardly directed surface disposed at an angle to the general plane of the faces of said circular base, said inwardly and downwardly directed surface joining the inner surface of said projection at a sharp angle, and a downwardly and outwardly inclined circumferential clamping surface on said projection extending from said inwardly and downwardly directed surface to said substantially cylindrical cover-engaging surface on said flange; means for clamping said end disks ,in assembled position with their axial flanges extending in opposite directions and forming an annular cover-receiving recess defined by said cover-engaging surfaces of said flanges and said oppositely disposed downwardly and outwardly'inclined circumferential clamping surfaces of said projections; and a hollow cylindrical rollcover disposed within said annular cover-receiving recess, said roll cover comprising --an outer compressible flber working facing layer 'and an inner substantially incompressible reinforcing layer substantially coextensive axially with said outer facing layer,-the inside diameter of said inner reinforcing layer substantially coinciding with the diameter of v said cylindrical cover-engaging surfaces of said flanges, the axial length of said inner reinforcing layer being greater than the distance between said inwardly and downwardly directed surfaces of said projections when said circular bases are in juxtaposed clamped position, and the thickness of said inner reinforcing layer being less than the height of said projections'measured as the distance from said cylindrical cover-engaging surfaces of said flanges to said inwardly and downwardly directed surfaces of said projections, said inwardly and downwardly directed surfaces engaging said outer facing layer and said inner reinforcing layer with said inwardly and downwardly directed surfaces of said projections engaging said outer facing layer in the vicinity of the joint between said outer facing layer and said inner reinforcing layer and said inclined circumferential clamping surfaces of said projections engaging said outer facing layer and said inner reinforcing layer and urging the inner cylindrical surface of said inner reinforcing layer into engagement with said cover-engaging surfaces of said flanges, said outer facing layer being free of radial expansion which would distort the fiber working surface thereof.

9. In a textile fiber drafting roll comprising a pair of clamping end disks each formed of a generally circular base, a substantially cylindrical flange extending axially outwardly from the base, a substantially cylindrical cover-engaging surface on said flange, a hollow bead on the terminal end of said flange and extending outwardly, up-

wardly, and inwardly and terminating in a cut surface, and a downwardly and outwardly inclined circumferential clamping surface on said bead, means for clamping said end disks in assembled position with their axial flanges extending in opposite directions and forming an annular coverreceivmg recess defined by said cover-engaging surfaces of said flanges and the oppositely disposed downwardly and outwardly inclined circumferential clamping surfaces of said beads; a hollow cylindrical cover comprising an outer com pressible fiber working facing layer and an inner hollow cylindrical substantially incompressible reinforcing layer formed of fibers impregnated with a stiffening agent, said inner reinforcing layer resisting deformation from axial pressure, said inner reinforcing layer being substantially coextensive axially with said outer facing layer, the cover beingconstructed and arranged to be received within said annular cover-receiving recess in the drafting roll with the inside diameter of said inner reinforcing layer substantially coinciding with the diameter of said cylindrical cover-engaging surfaces of said flange with the cut surfaces of said beads engaging said outer facing layer in the vicinity of the joint between said outer facing layer and said inner reinforcing,

layer and said inclined circumferential clamping surfaces of said beads engagingsaid outer facing layer and said inner reinforcing layer and urging the inner cylindrical surface of said inner reinforcing layer into engagement with said coverengaging surfaces of said flanges whereby the outer facing layer will be free ofradial expansion which would distort the fiber working surface thereof. v

10. In a textile fiber drafting roll comprising a pair of clamping end disks each formed of a generally circular base, a substantially cylindrical flange extending axially outwardly from the base,

a substantially cylindrical cover-engaging surface on said flange, a hollow beadv on the tersembled position with their axial flanges extending in opposite directions and forming an annular cover-receiving recess defined by said coverengaging surfaces of said flanges and the oppositely disposed downwardly and outwardly inclined circumferential clamping surfaces of said beads; a hollow cylindrical cover comprising a hollow cylindrical substantially incompressible inner reinforcing layer formed of fibers impregnated with a stifiening substance, said layer resisting deformation from axial pressure, an outer yielding and compressible fiber drafting facing layer, and a layer of vulcanized cement interposed between said outer facing layer and said inner reinforcing layer and bonding the two together, said ll inner reinforcing layer holding said outer facing layer against deformation of the working surface thereof upon the application of axial pressure to said outer facing layer in the vicinity of the joint between said inner reinforcing layer and said outer facing layer, said inner reinforcing layer being substantially coextensive axially with said outer facing layer, the cover being constructed and arranged to be received within said annular cover-receiving recess in the drafting roll-with the inside diameter of said inner reinforcing layer substantially coinciding with the diameter of said cylindrical cover-engaging surfaces of said flange with the cut surfaces of said beads engasins said outer facing layer in the vicinity of the Joint between said outer facing layer and said inner reinforcing layer and said inclined circumferential clamping surfaces of said beads engaging said outer facing layer and said inner reinforcing layer and urging the inner cylindrical surface of said inner reinforcing layer into engagement with said cover-engaging surfaces of said flanges whereby the outer facing layer will be free of radial ex- 12 pension which would distort the fiber/working surface thereof.

EDWARD J. COURTNEY.

nnrnnnncns crrnn The following references are of record in the file of this patent:

UNITED STATES PATENTS 1 Number Name Date 1,730,357 Carpenter Oct. 8. 1030 1,904,498 McGhee Apr. 18, 1933 2,012,223 Cutler Aug. 20, 1938 2,023,438 Ray Dec. 10, 1936 15 2,256,193 Cobb Sept. 16, 1041 2,304,656 Rockoff Dec. 8, 1042 2,417,239 Courtney Mar. 11, 104'! FOREIGN PATENTS 20 Number Country Date 2,074 Great Britain of 1064 12,580 Great Britain of 1904 196,361 Great Britain Apr. 10, 1023 

